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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667ce4ec55592358c3bd17acaee6ad1870cf48c5814d09a3ace082a604106490' 
  AND token = 'TElaBKO+me845VbZON4Nx7FLLxQUaV9KwsFjU+BuCBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}